<template>
  <div class="my-tab-bar">
    <div class="tab-item" v-for="(item, index) in arr" :key="item.text" :class="{current: activeIndex === index}" @click="onTabBar(index, item)">
      <!-- 图标 -->
      <span class="iconfont" :class="item.iconText"></span>
      <!-- 文字 -->
      <span>{{ item.text }}</span>
    </div>
  </div>
</template>

<script>
export default {
  props: {
    arr: {
      // 约束数据类型
      type: Array,
      // 设置为必传项
      required: true,
      // 自定义约束
      validator (value) {
        // if (value.length >= 2 && value.length <= 5) return true
        // return false
        return value.length >= 2 && value.length <= 5
      }
    }
  },
  data () {
    return {
      activeIndex: 0
    }
  },
  methods: {
    onTabBar (i, item) {
      this.activeIndex = i
      this.$emit('tabBarItem', item.componentName)
    }
  }
}
</script>

<style lang="less" scoped>
.my-tab-bar {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: white;
  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}

.current {
  color: #1d7bff;
}
</style>
